Bathtub



FIG. 1 is a perspective view of a bathtub showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4; and,

FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 4.

The broken lines shown are included for the purpose of illustrating the unclaimed portions of the bathtub and form no part of the claimed design. 

CLAIM The ornamental design for a bathtub, as shown and described. 